linux-kernel - Re: [PATCH tip/core/rcu 20/45] torture: Include "Stopping" string to torture_kthread

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Message-ID: <20140510001346.GC8754@linux.vnet.ibm.com>
Date:	Fri, 9 May 2014 17:13:46 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	josh@...htriplett.org
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH tip/core/rcu 20/45] torture: Include "Stopping" string to
 torture_kthread_stopping()

On Wed, May 07, 2014 at 02:37:36PM -0700, josh@...htriplett.org wrote:
> On Mon, Apr 28, 2014 at 05:25:08PM -0700, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > 
> > Currently, torture_kthread_stopping() prints only the name of the
> > kthread that is stopping, which can be unedifying.  This commit therefore
> > adds "Stopping" to make things more evident.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> Feedback below.
> 
> >  kernel/torture.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/kernel/torture.c b/kernel/torture.c
> > index acc9afc2f26e..f329848c3eee 100644
> > --- a/kernel/torture.c
> > +++ b/kernel/torture.c
> > @@ -674,8 +674,11 @@ EXPORT_SYMBOL_GPL(torture_must_stop_irq);
> >   */
> >  void torture_kthread_stopping(char *title)
> >  {
> > +	char buf[128];
> > +
> > +	snprintf(buf, sizeof(buf), "Stopping %s", title);
> >  	if (verbose)
> > -		VERBOSE_TOROUT_STRING(title);
> > +		VERBOSE_TOROUT_STRING(buf);
> 
> This seems like a case where the macro has led to poorer code; rather
> than using sprintf into a temporary buffer, this should just print.
> Please consider fixing the output macros to allow formats, as the pr_*
> macros do.
> 
> Also, why do you need "if (verbose)" if the name of the macro has
> VERBOSE_ in it; shouldn't that mean it checks verbosity itself?
> (Another good reason not to create a unique verbosity level mechanism,
> and to use the kernel mechanisms instead.)

Good catch, removed the redundant "if (verbose)".

My attempts in the past to leverage existing in-kernel verbosity controls
has caused problems such as the output appearing or not depending on
the distro in question.

							Thanx, Paul

> >  	while (!kthread_should_stop()) {
> >  		torture_shutdown_absorb(title);
> >  		schedule_timeout_uninterruptible(1);
> > -- 
> > 1.8.1.5
> > 
> 

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